[alsa-devel] [PATCH v3 1/4] DRM: add help to get ELD speaker allocation

[Jani Nikula]

On Mon, 19 Dec 2016, Arnaud Pouliquen <arnaud.pouliquen at st.com> wrote:
> Add helper to allow users to retrieve the speaker allocations without
> knowledge of the ELD structure.
>
> Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen at st.com>

I've already replied with my Reviewed-by, please take care to include
them.

Reviewed-by: Jani Nikula <jani.nikula at intel.com>


> ---
>  include/drm/drm_edid.h | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
>
> diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
> index c3a7d44..de93543 100644
> --- a/include/drm/drm_edid.h
> +++ b/include/drm/drm_edid.h
> @@ -248,6 +248,7 @@ struct detailed_timing {
>  # define DRM_ELD_AUD_SYNCH_DELAY_MAX	0xfa	/* 500 ms */
>  
>  #define DRM_ELD_SPEAKER			7
> +# define DRM_ELD_SPEAKER_MASK		0x7f
>  # define DRM_ELD_SPEAKER_RLRC		(1 << 6)
>  # define DRM_ELD_SPEAKER_FLRC		(1 << 5)
>  # define DRM_ELD_SPEAKER_RC		(1 << 4)
> @@ -415,6 +416,18 @@ static inline int drm_eld_size(const uint8_t *eld)
>  }
>  
>  /**
> + * drm_eld_get_spk_alloc - Get speaker allocation
> + * @eld: pointer to an ELD memory structure
> + *
> + * The returned value is the speakers mask. User has to use %DRM_ELD_SPEAKER
> + * field definitions to identify speakers.
> + */
> +static inline u8 drm_eld_get_spk_alloc(const uint8_t *eld)
> +{
> +	return eld[DRM_ELD_SPEAKER] & DRM_ELD_SPEAKER_MASK;
> +}
> +
> +/**
>   * drm_eld_get_conn_type - Get device type hdmi/dp connected
>   * @eld: pointer to an ELD memory structure
>   *

-- 
Jani Nikula, Intel Open Source Technology Center